Drawing-compasses.



'PATENTED OCT. 1a, 1903.

DRAWING GOMPASSES.

APPLICATION FILED JULY 13, 1903.

N0 MODEL.

Figz;

my. a.

Wiinesses UwrTup STaTns Patented October 13, 1903.

PATIENT rrrcut JOHANN WILD, OF SUHR, NEAR AARAU, SWITZERLAND, ASSIGNORTO J OHANN BOSSART, OF BUCHS, NEAR AARAU, SWITZERLAND.

DRAWING GOMPASSES.

SPECIFICATION forming part of Letters Patent No, 741,425, dated October13, 1903.

Application filed July 13, 1903.

To all whom it may concern.-

Be it known that I, JOHANN WILD, a citizen of the Republic ofSwitzerland, residing at Suhr, near Aarau, Switzerland, have inventednew and useful Improvements in Drawing" Compasses, of which thefollowing is a specification.

The present invention has reference to improvements indrawing-compasses, and relates more especially to a new construction ofneedle-point; and the object of the invention is to provide meanswhereby the needlepoint may be moved axially within the leg of thecompasses by turning a small wormwheel.

In order to make the invention more readily understood, I will describeit with reference to the accompanying sheet of drawings, Figure 1 ofwhich shows a side elevation of the lower leg end of the compassesprovided with my improvement. Fig. 2 is a sectional elevation thereof,and Fig. 3 shows a front elevation of the worm-wheel.

The letter of reference (t denotes the lower part of the leg of thecompasses, within which slides the needle-point 0, provided on one sidewith a toothed rack 11. Within a recess d, covered by a plate g, is journaled a wormwheel .9 with a spirally-running worm h, a centraltrunnionfengaging a corresponding journal-hole in the plate 9. Theworm-wheel being journaled at a slant relative to the needle-point, onlyits lower part engages the toothed rack, as clearly shown in Fig. 2. Foraltering the position of the needle-point Serial No. 165,334. (Nomodel.)

within the leg the worm-wheel is rotated one way or the other, accordingto the desired direction of travel.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In drawing-compasses, the combination of theneedle-point, adapted to slide within the leg of the compasses,a'toothed rack on said needle-point, a worm-wheel adapted to mesh withthe said toothed rack, and means for journaling said wormwvheel in theleg of the compasses, substantially as and for the purpose set forth.

2. In drawing-compasses, the combination of the needle-point, adapted toslide within the leg of the compasses, a toothed rack on saidneedlepoint, a worm-wheel slantingly journaled within a recess in theleg of the compasses and meshing with said toothed rack, a platecovering the recess for said WOIIIl-WllGBl, and a central trunnion onsaid worm-wheel adapted to engage a corresponding journal-hole in saidcover-plate, the parts being constructed, arranged and cooperating,substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHANN WILD. l/Vitnesses:

MORITZ VEITH,

A. LIEBERKNEOHT.

